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Dioecism of the genusCallicarpa (Verbenaceae) in the Bonin (Ogasawara) Islands

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Abstract

The morphology and function of the flowers of three species of the genusCallicarpa, C. glabra, C. nisnimurae andC. subpubescens, endemic to the Bonin Islands, revealed that all three species were dioecious. Male plants had short-styled flowers with sterile ovaries, while female plants had long-styled flowers with non-germinating inaperturate pollen grains. Such dioecism has never been reported from the family Verbenaceae. This curious sexual system with non-germinating pollen grains may have been maintained as a reward to insect pollinators.

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  1. Department of Biology, Faculty of Science, Kagoshima University, Kohrimoto, 890, Kagoshima

    Nobumitsu Kawakubo

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  1. Nobumitsu Kawakubo
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Kawakubo, N. Dioecism of the genusCallicarpa (Verbenaceae) in the Bonin (Ogasawara) Islands. Bot. Mag. Tokyo 103, 57–66 (1990). https://doi.org/10.1007/BF02488411

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  • DOI: https://doi.org/10.1007/BF02488411

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